1946. Original wrappers in near fine good condition. In The Condor A Magazine of Western Ornithology Vo. 44 No. 6, November-December 1942, pp237-300. Regulation of Spring Migration in Juncos, a study which details the internal and external factors that regulate the spring migration of the Oregon Junco. The complete number, additional articles include: Unusual Numbers of Dead Birds on the Washington Coast; A life History Study of the White-tailed Kite and The Northern Races of Piranga flava.